Lock-stitch sewing-machine.



N0- 800,554. PATENTED SEPT. 26, 1905. M. T. DENNE.

LOCK STITCH SEWING MACHINE,

APPLICATION FILED AUG.24,1903.

6 SHEETS-SHEET 1.

PATENTED SEPT. 26, 1905.

M. T. DENNE. LOCK STITCH SEWING MACHINE.

APPLICATION FILED AUG. 24, 1903.

6 SHEETS-SHEET 2.

LIMA I No. 800,554. PATENTBD SEPT. 26.1905. M. T. DENNE. LOCK STITCHSEWING MACHINE.

APPLICATION FILED AUG. 24. 1903.

6 SHEETB-SHBET 3.

No. 800,554. PATENTED SEPT. 26, 1905. M. T. DENNE.

LOCK STITCH SEWING MACHINE.

APPLICATION FILED AUG. 24. 1903.

6 SHEETS-SHEET 4.

f v (r wunnmuu w 7 3 Minus 6'. 1 I? 5 I'll/mil PATENTED SEPT. 26, 1905.

M. T. DENNE.

LOCK STITCH SEWING MACHINE.

APPLIOATION FILED AUG. 24, 1903.

No. 800,554. v PATENTED SEPT. 26, 1905.

. M. T. DENNE.

LOCK STITCH SEWING MACHINE. APPLIOATION FILED AUG. 24, 1903.

6 SHEETS-SHEBT 6.

uiwm zi @WM UNITED STATES ATENT onFroE.

MARK THOMAS DENNE, OF RUSHDEN, ENGLAND, ASSIGNOR TO JOHN CAVE AND SONS,LIMITED, OF RUSHDEN, ENGLAND.

LOCK-STITCH SEWING-MACHINE.

Specification of Letters Patent.

Patented Sept. 26, 1905.

Application filed August 24, 1903. Serial No. 170,635.

To (1.7] 1071/0111 it may concern.-

Be it known that 1, MARK THOMAS DENNE,a subject of the King of GreatBritain, residing at College street, Rushden, county of Northampton,England, have invented new and useful Improvements in Lock-StitchSewing-Machines, of which the following is a specification.

This invention relates to lock-stitch sewingmachines for welting andturn-shoe work, and more particularly of the kind in which a semirotarybarbed needle, a semirotary awl or pricker, and a rotary shuttle movingin a plane at right angles to the needle and awl are employed, andcomprises the improvements hereinafter described.

In the accompanying drawings, Figure 1 is a sectional side elevation ofa lock-stitch welting or turn-shoe sewing-machine constructed accordingto my invention. Fig. 2 is a sectional plan of the machine with thewax-pot removed. Fig. 3 is a sectional front elevation of the machinewith a bracket carrying the needle thread controlling mechanism removed.Fig. 4 is a section on the line 4: 4:, Fig. 1. Fig. 5 is a section onthe line 5 5, Fig. 1. Fig. 6 is a rear elevation illustrating thearrangement of the looper, thread-hook, and needle. Fig. 7 is a similarview to Fig. 6, but showing the parts in a dilferent position. Fig. 8 isa vertical section principally illustrating the arrangement of theloop-opener. Fig. 9 is a section on the line 9 9, Fig. 8. Fig. 10 is aside elevation illustrating the arrangement of the thread-lock andpull-off and their operating mechanisms. Fig. 11 is a sectional plan ofthe thread-lock, the section being on the line 11 11, Fig. 1 0. Fig. 12is a sectional plan of the pull-off, the section being on the line 1219., Fig. 10; and Fig. 13 is a section on'the line 13 13, Fig. 10. Fig.14: is a sectional side elevation showing a modification in the drivingmechanism for the thread-hook. Figs. 15 and 16 are views similar toFigs. 6 and 7 of this arrangement. Figs. 6, 7, 8, 9, and 13, 14, 15, and16 are drawn to a larger scale than the rest of the figures.

Similar reference letters indicate corresponding parts throughout thedrawings.

a is the main frame of the machine, and Z; is the main or driving shaft,supported in the removable bearings b b.

0 is the semirotary curved needle supported on the toothed carrier 0,designed to be oscillated upon the spindle 0 from the needlecam 0through the medium of the toothed bellcrank 0, fulcrumed on the pin 0(Zis the semirotary awl or pricker for feeding the work supported on thetoothed carrier (Z, designed to be oscillated (to grip the work) uponthe spindle c from the awl-cam (Z through the medium of the toothedbell-crank (Z fulcrumed on the pin 0 The said awl is moved laterally tofeed the work by the slideblock (F, lever (Z (adjustably connected tothe block,) and cam d. a

e is the channel-guide, also connected to the block (Z f is the rotaryshuttle, having the hook f for engaging the needle-thread A and mountedin the shuttle-race f and driven from the main shaft 6 by the helicalgear-wheels f f shaft f", and driver f.

g is the hinged plate or lid for holding the shuttle-spool g in positionin the shuttle and preventing the same rotating with the latter.

h is the welt-guide for use with welted work, the said guide beingpivoted axially with the needle and awl, so that it can turn and beadjusted relatively with the channelguide 6 against the tension of itsspring h, according to the thickness of the work, the said welt-guidehaving a segment of teeth if, designed to be locked by a pawl it",operated by a lever if and cam if when the needle is passing through thework and to be free of the pawl when placing work in the machine. Thepressure of the welt-guide upon the work while being fed by the awl isalso relieved without releasing the pawl if by a lever h, upon which thepawl k and lever h are mounted, and a cam-groove [b in a cam-disk i.

j is the main take-up lever, actuated from the cam-groove j in the diskby the lever f is the auxiliary spring take-up, and Z; is theneedle-thread tension-wheel,around which the needle-thread A passes onits way to the thread-lock hereinafter described.

All the foregoing parts are of known construction.

The improvements will now be described.

Zis a looper or device for assisting to thread the needle 0, thethread-delivery end of said looper being in the form of an eye, as shownin Figs. 4, 6, and 7, and having the needlethread A passing through itdirect from the main take-up j. The looper Z is carried at one end of ashaft l, mounted in a bearing Z on a forwardly-projecting bracket m,attached t9 the main frame a, the axis of the shaft being tangential tothe circular path of the needle. The shaft 1 is formed hollow for thepassage of the thread from the main take-up to the looper I and iscaused to oscillate the looper at the required time by a toothed segmentI on the shaft, a rack-bar Z" engaging the said pinion and sliding in aguide Z on the bracket m, a bell-crank l fulerumed by a spindle to abracket a on the frame a and having one end toothed and engaging therack-bar Z", a second bell-crank Z fulerumed at I" to the bracket a andhaving one end engaging the bell-crank Z by means of a slideblock andguide and a cam-groove Z in a disk 0 on the shaft /1 engaging a roll onthe bell-crank I.

is a thread-hook arranged to cooperate with the looper to thread theneedle 0. The said hook is mounted in a holder 72 on a shaft p arrangedin a bearing 1) in the bracket m, so as to be parallel with thelooper-shaft l. The shaft 1) is caused to oscillate the threadhook atthe required time by a toothed segment on the said shaft, a rack-bar 7fengaging the said segment and sliding in a guide 7) on the bracket m, abell-crank p pivoted on the spindle 7 in the bracket )1 and having oneend toothed and engaging the rackbar p, a second bell-crank 7) pivotedat p" to the bracketnand havingone end engaging the bellcrank 11 bymeans of teeth p and a cam-groove p in the disk 0 engaging a roll on thebellcrank p. The looper and thread-hook operating mechanisms are soarranged relatively with the needle-operating n'iechanism that when theneedle is in its extreme forward position, as indicated in Figs. 1 anda, the said looper and thread-hook are in the position shown clearly inFig. 6 that is to say, with the eye of the looper and the hook in line,so that the thread is engaged with the hook. The further movement of themain shaft .71 causes the cam-grooves Z and p to move the looper Z andthread-hook 7) in the direction of the arrows, Fig. 6, to the positionshown in Fig. 7. The eye of the looper is placed eccentrieally of thelooper-shaft or in a cranked position as to the same, so that a movementof the looper-shaft gives such eye a movement in a curved line, andmotion is imparted to the looper-shaft to cause the eye, with thethread, to pass downwardly beneath the needle to the opposite side ofthe same. The thread-hook is secured to an arm in the nature of acrank-arm, so that its movement is also in a curved line, and suchmovement is upward and toward the opposite side of the needle above thesame, the two thereby pulling the thread across into contact with theneedle, so that as the latter retires its barb will engage the threadand pull it through the work in the form of a loop in the usual manner.This construction insures the engagement of the thread by the hook ofthe needle with the minimum amount of movement on the part of the looperand threadhook.

Instead of the shaft 79 carrying the threadhook )7, being driven throughthe medium of the rack-bar p, as hereinbefore described, the latter canbe dispensed with, the segment 7)" and bell-crank 71 being arranged togear together, as shown in Figs. 14, 15, and 16. By gearing the segmentp" and bell-crank p together it will be seen that it is necessary toarrange the shaft 712 parallel with the axis of the said bell-crankinstead of arranging it parallel with the shaft Z, as hereinbeforedescribed.

Figs. 15 and 16 illustrate the operation of laying the thread in thebarb of the needle by the arrangement just described.

q is a device or loop-opener for assisting to form the loop on theneedle for the better engagement therewith of the shuttle. Thisloopopener is of the form shown clearly in Figs. 5 and 8 and is carriedby a ring (1, mounted freely upon the shuttle-shaftf so as to beconcentric with the axis of the shuttlef, the point of the said openerextending down so as to engage the loop on the needle at a point belowthat at which the shuttle-hookf" engages the loop, as shown clearly inFig. 8.

Means suitable for oscillating the ring, and with it the opener,comprise gear-teeth on the ring, a bell-crank If, fulerumed at (1" andhaving at one end a segment of gear-teeth to engage the teeth q, and acam-recess on the disk 2 Figs. 10 and 12, on the shaft I), with whichrecess a roll on the other end of the bell-crank g engages, a spring (1,Fig. 1, connected at one end to the said bell-cran k and at the otherend to the frame a, serving to keep the bell-crank in contact with thesurface of the disk 5 and cause it to enter the cam-recess q The ring qis oscillated so that the opener q crosses the path of the needle justbelow its point as it rises from the work r, Fig. 8, to its extreme rearposition, carrying the loop s of thread, the needle in its movementdrawing one side of the loop over the flattened rear surface of theopener immediately behind the point of the latter, so that the loop isformed triangular, as shown. By the described arrangement it will beseen that the side of the loop extending between the opener and theneedle when the latter is at the end of its rear movement, as shown inFig. 8, will always maintain the same posit-ion relatively with theshuttle for the engagement therewith of the shuttle-hook fnotwithstanding that the point at which the loop is connected to thework s may vary, owing to varying thicknesses of the work.

A needle-thread-locking device is employed comprising two blocks 1 t,Figs. 1, 10, and 11, having suitable gripping-surfaces between which thethread passes from the tension-wheel X: to a pull-off device hereinafterdescribed. l The block t is arranged to slide in a guide t Fig. 13,onthe bracket m and is actuated to grip the thread by the periphery ofthe disk 2 through the medium of a bell-crank-lever t fulcrumed at t" tothe frame a, and a connecting rod or link i a cam-surface 2? beingformed on the disk 2' to allow the grip on the thread to be relieved atthe required time by the action of a spring 25 on the lever 6 The block2," is carried by a pin t in a hole in the bracket m, the part of thepin carrying the said block being formed eccentric to the main part ofthe pin, so that by rotating the said pin the block can be adjustedrelatively with the block t,

t is a set-screw for locking the pin t when adjusted.

For pulling off from the thread-ball the required amount of thread forthe needle for each stitch a pull-off device is employed in the form ofa bar or block a, Figs. 1. 10, 12, and 13, carried upon a slide-block a,working in a guide 20 upon the bracket m and actuated by a cam-grooveuin the diski through the medium of a lever 21 fulcrumed at a to theframe a, and a connecting rod or link a. The bar a is adjustable uponthe block a, it being for this purpose provided with a slot 20 throughwhich pass set-screws a into the said block. By adjusting the bar uponthe block it will be seen that more or less thread can be pulled ofi ateach backward movement of the bar, according as it strikes the threadearly or late during such movement.

The thread-measuring devices herein shown and described are not hereinspecifically claimed, as they form the subject-matter of a divisionalapplication filed by me May 9, 190a, and given Serial No. 207,123.

From the foregoing description it will be seen that the whole of theneedle-thread-controlling inechanism-viz., the looper Z, the thread-hookp, the main take-up 2;, the spring take-up j, the thread-lock t 25, thepull-off u, and tension-w heel 7t'are arranged at the front of themachine, whereby they are rendered easy of access, and by mounting themupon a bracket, such as m, insulated by a suitable non-conductor ofheat, such as mica, as indicated at m, from the main frame a the heatwhich is employed to facilitate the working of the waxed needle-threadis prevented from being communicated to the said main frame.

of m are screws for securing the bracket m to the frame a.

m, Figs. 1 and 2, is a movable guard for covering the front of thebracket in and protecting the main take-up The said guard is alsoprovided with an additional piece of for covering the rack-bar Z andtoothed portion of the bell-crank Z and is pivoted at m to the bracketm, a spring-catch on being provided on the guard, engaging a notch 2227,Figs. 1 and 10, in the bracket 02/. to lock the guard m in its loweredposition, as shown in Fig. 1.

o is a wax-pot arranged at the upper part of the machine for waxing theneedle-thread A and supported within a water-jacket e, designed to beheated by Bunsen burners o 0 Figs. 1 and 3, the said wax-pot having. arim o whereby it is supported within the said jacket, which is attachedto the frame a by a pin '0 entering a hole o Figs. 1 and 2.

c, Fig. 1, is a stripping device through which the thread passes to thetension-wheel 7': and which serves to remove the superfluous wax fromthe thread A. The device o is connected to the lower end of a tube of,attached to the outer wall of the jacket 0;, and passes through the saidjacket and over the top edge of the wax-pot, as shown clearly in Fig. 1.By the described construction it will be seen that the wax-pot can beeasily removed without disturbing the tube '0 and stripping device o.

The thread-waxing mechanism above described is not claimed specificallyherein.

For simultaneously closing and locking the hinged plate or lid g afterplacing the shuttle-spool in position within the shuttle the followingmeans are employed that is to say, the pin to, Figs. 8 and 9, uponwhich-the said plate hinges, is formed with a screw-thread w, engaging acorresponding thread in a hole in the said plate, and a spring-block wis arranged to bear upon the said pin. By this arrangement, assuming theplate to be in the open position, if the pin be turned in the directionof the arrow, Fig. 8, by the arm 103 the friction between the block 20and the said pin will cause the plate g to move into the position shownin the said figure, where it will be stopped by the surface 10* on theplate coming into contact with the opposing face of the shuttle-race.The continued movement of the arm 20 then results in a slight relativescrewing movement between the pin 20 and the plate g, thereby drawingthe said plate tightly against the side of the lug 20 on theshuttle-race and looking it.

The operation of the improved machine is as follows: Assume the parts tobe in the position shown in Figs. 1, 2. and 3-that is to say, with theneedle 0 in its extreme forward position and the awl or pricker (Z inits extreme backward position. If the shaft I) be rotated in thedirection of the arrow, Fig. 1, the looper Z and thread-hook 1) will bemoved to engage the needle-thread A with the needle 0 in the mannerhereinbefore described. The needle then will move back through the work,drawing the thread in the form of a loop, and just before reaching itsextreme backward position the loop-opener q engages with the loop, thecontinued movement of the needle producing the triangular loop 8, ashereinbefore described. The shuttle f then engages the loop, the needleand loop-opener simultaneously releasing the said loop. The loop is thencarried around the shuttle, thereby inclosing the shuttle-spool threadin the usual manner, the main take up 7' drawing the needle-threadthrough the work over the shuttle-thread. When the main take-up reachesits highest point, the thread-lock t 6 opens and the pull-off a pullsoff the thread for the next stitch. The needle 0 then again movesforward, the awl or pricker (Z during the first part of such movementfeeding the work the length of the stitch required, the needle thenpassing through the work to the position shown in the drawings, thuscompleting the cycle of operations for the production of one stitch.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In a sewing-machine of the kind hereinbeforedescribed the combination with a semirotary needle and a main take-updevice of a looper the thread-delivery end of which is in the form of aneye for the passage of the needle-thread, a hollow shaft supporting thelooper and having its axis tangential with the circular path of theneedle and through which shaft the needle-thread passes direct from thesaid main take-up to the looper, a thread-hook for cooperating with thelooper to thread the needle, a shaft supporting the same and arrangedparallel with the looper-shaft, and means for oscillating the looper andthreadhook shafts each comprising a toothed segment on the shaft, arack-bar gearing therewith, a toothed bell-crank gearing with therack-bar, another bell-crank engaging the toothed bell-crank and a camon the main shaft engaging the second bell-crank, substantially asdescribed.

2. In a machine of the kind hereinbefore described the combination witha semirotary needle and a main take-up device of a looper the threaddelivery end of which is in the form of an eye for the passage of theneedlethread, a hollow shaft supporting the looper and having its axestangential with the circular path of the needle and through which shaftthe needle-thread passes direct from the said main take-up to thelooper, a thread-hook for cooperating with the looper to thread theneedle, means for oscillating the looper comprising a toothed segment onthe shaft, a rackbar gearing therewith, a toothed bell-crank gearingwith the rack-bar another bell-crank engaging the toothed bell-crank anda cam on the main shaft engaging the second bell-crank and means foroscillating the thread-hook shaft comprising a toothed segment on theshaft, a toothed bell-crank gearing with the said segment anotherbell-crank engaging the toothed bell-crank and a cam on the main shaftengaging the second bell-crank, substantially as described.

3. In a sewing-machine of the kind hereinbefore described thecombination with a semirotary needle and a shuttle rotating in a planeat right angles to the needle of an oscillating 1oopopener, moving in acurved path about the axis of rotation of the shuttle, and means foroperating it from the main shaft of the machine, the said opener beingdesigned to enter the loop of thread carried by the needle, thecontinued movement of the needle drawing one side of the loop over theopener so that the loop is formed triangular, substantially as, and forthe purpose, described.

4. In a sewing-machine of the kind hereinbefore described thecombination with a semirotary needle and a shuttle rotating in a planeat right angles to the needle of an oscillating loop-opener a ringconcentric with the shuttle-axis supporting the said opener and havinggear-teeth, a toothed bell-crank gearing with the teeth in the ring, acam on the main shaft of the machine with which the bellcrank engagesand a spring for keeping the latter in contact with the earn, the saidopener being designed to enter the loop of thread carried by the needle,the continued movement of the needle drawing one side of the loop overthe opener so that the loop is formed triangular substantially as, andfor the purpose, described.

5. In a sewing-machine of the kind hereinbeforc described thecombination with the shuttle-race of a hinged plate or lid for holdingthe spool in position in the shuttle, of a screwed hinged pin, ascrew-threaded hole in the said lid engaging the screw on the pin and aspring-block bearing upon the pin, substantially as, and for thepurpose, hereinbefore described.

6. In a sewing-machine of the class described, the combination with theneedle, of a shuttle and means for rotating the same, a loop-openercooperating with said shuttle and means for oscillating the same, thesaid loop-opener when engaging the needle-thread moving in the oppositedirection to the movement of the shuttle, substantially as described.

7. In a sewing-machine of the class described, the combination with theneedle, of a looper and thread-hook normally lying in closejuxtaposition at one side of the path of the needle and in the hook sideof the needle, the construction including provisions for moving thelooper and thread-hook to the opposite side of the needle one below andthe other above the needle, whereby the thread is drawn tightly againstthe needle below its hook, substantially as described.

8. In a sewing-machine of the class described, the combination with theneedle, of a looper having its thread-engaging end in the form of an eyefor the passage of the thread, and a thread-hook, the two when in astate of rest lying together at the hook side of the path of the needle,the construction including provisions for simultaneously moving thelooper and thread-hook from this position to the opposite side of theneedle, one above and one below the needle, substantially as described.

9. In a sewing-machine of the class described, the combination with theneedle, of a looper having its thread-engaging end in the form of an eyefor the passage therethrongh of the thread, said eye being locatedeccentrically as to the main body of the shaft, said shaft having itsaxis tangential to the path of the needle, and a thread-hook normally onthe hook side of the path of the needle, the constructionincluding meansfor simultaneously moving the looper and threadhook to the opposite sideof the needle, substantially as described.

10. In a sewing-machine of the class de scribed, the combination withthe needle, of a looper having its thread-delivery end 1n the form of aneye, said eye being eccentric to described. I

.MARK THOMAS DENNE.

Witnesses:

JAMES FERRABEE, GEORGE HERBERT PERKINS.

